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Vinvika [58]
2 years ago
8

Determine the speed of a falling object 7.8 sec after it dropped.

Physics
1 answer:
butalik [34]2 years ago
7 0

Answer:

76.4m/s

Explanation:

Given parameter:

Time taken  = 7.8sec

Unknown:

Speed after it dropped  = ?

Solution:

To solve this problem, we use one of the kinematics equation:

      V  = U + gt

V is the final speed

U is the initial speed  = 0m/s

g is the acceleration due to gravity

t is the time taken

       V  = 0 + 9.8 x 7.8  = 76.4m/s

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2 years ago
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The index of refraction for a certain type of glass is 1.641 for blue light and 1.603 for red light. When a beam of white light
exis [7]

Answer:

The angle between the emergent blue and red light is 0.566^{o}

Explanation:

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n_{1}sin(\theta _{i})=n_{2}sin(\theta _{r})

Since medium from which light enter's is air thus n_{1}=1

Thus for blue incident light we have

1\times sin(40.05)=1.641\times sin(\theta _{rb})\\\\\therefore \theta _{rb}=sin^{-1}(\frac{sin(40.05)}{1.64})\\\\\theta _{rb}=23.10

Similarly using the same procedure for red light we have

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3 years ago
Marvin Martian is standing on planet Potatoine.
prisoha [69]

Answer:

W = 113.98 N

Explanation:

Given that,

Radius of PotatoineR=6.4\times 10^6\ m

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We need to find his weight on Potatoine. Weight of an object is given by :

W = mg

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So,

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2 years ago
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schepotkina [342]
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5 0
3 years ago
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A person is pushing a box. The net external force on the 60-kg box is stated to be 90 N. If the force of friction opposing the m
Tems11 [23]

Answer:

b.1.5m/s^2

Explanation:

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